In that case, I ordered this a while back and it works good.https://www.amazon.com/gp/product/B010U ... UTF8&psc=1
I paid ~$10 for it, but Amazon seems to no longer list it for sale.
They do list this one, but I don't care for it as much as it seems to lack the inner parts where your J1772 O-ring would wrap around, making a seal to keep the bugs out.https://www.amazon.com/ORIGINAL-evCHARG ... j1772+dock
This one looks good but IMO is overpriced!https://www.amazon.com/J1772-electric-h ... j1772+dock
I'm guessing for the best seal the rubber cover I linked earlier may be best for the OP, most like the OEM cover.
2012 SL purchased used 2/'16
2013 S w/QC purchased new
Juicebox Premium 60a L1/L2 EVSE, Ebusbar 16a L1/L2 EVSE
'12 EVSEupgrade'd 20a L1/L2 EVSE, '13 EVSEupgrade'd adjustable 6-20a L2, 6-13a L1 EVSE
Zencar 13, 20, 30a L1/L2 portable EVSE
GE Durastation 30a